Rows of potato bushes on a plantation under agrofibre and open air. Hardening of plants in late spring. Agroindustry, farming. Growing crops in a colder early season. Greenhouse effect for protection.. Rows of potato bushes on a plantation under agrofibre and open air. Hardening of plants in late spring. Growing crops in a colder early season. Greenhouse effect for protection. Agroindustry, farming.